OL_P1254 Model (1) - TECO-Westinghouse Motor Company

Owing to the varied time and circumstances, motors are used, it is difficult to set the items andperiods for regular inspection and maintenance. However, as a guide it is recommended to beperformed periodically according to factory maintenance program. Generally, the inspectionscope determined by the following factors:(a) Ambient temperature.(b) Starting and stopping frequency.(c) Troublesome parts usually affecting motor functions.(d) Easily abraded parts.(e) The important position of motor in the operational system of a factory should be dulyrecognized. Therefore, its health and wellbeing should be fully protected especially whenit is operating in severe conditions.5.2 Motor windings:(a) Measurement of insulation resistance and standards to determine quality of insulationresistance, please refer to measures stated in 3.1.2 “Measurement of insulationresistance”.(b) Inspection of coil-ends:(1) Grease and dust accumulated on coils may cause insulation deterioration and poorcooling effect.(2) Moisture must not accumulate. Keep coils warm when motor is not in use if moisturecan be seen.(3) Discoloring. This is mainly caused by overheating.(c) Ensure no untoward change of wedges from original position.(d) Ensure the binding at the coil end is in its normal position.5.3 Clean the interior of the motor:(a) After a motor is in operation for some time, accumulation of dust, carbon powder andgrease etc., on the inside is unavoidable, and may cause damage. Regular cleaning andexamination is necessary to assure top performance.(b) Points to note during cleaning:(1) If using compressed air or blower:(a) Compressed air should be free of moisture.(b) Maintain air pressure at 4 kg/cm², since high pressure can cause damage to coils.(2) VacuumVacuum cleaning can be used, both before and after other methods of cleaning, toremove loose dirt and debris. It is a very effective way to remove loose surfacecontamination from the winding without scattering. Vacuum cleaning tools should benon-metallic to avoid any damage to thee winding insulation(3) WipingSurface contamination on the winding can be removed by wiping using a soft, lint-freewiping material. If the contamination is oily, the wiping material can be moistened(not dripping wet) with a safety type petroleum solvent. In hazardous locations, asolvent such as inhibited methyl chloroform may be used, but must be used sparinglyand immediately removed. While this solvent is non-flammable under ordinaryconditions, it is toxic and proper health and safety precautions should be followedwhile using it.18